Malicious PDF — malware analysis report

Static analysis result for SHA-256 2a30d26a40188d75…

MALICIOUS

PDF

83.0 KB Created: 2021-09-10 17:29:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: e8e9f2c984d614ded1a3fb0392dc0a99 SHA-1: 0c16aeeea9ab944caf1b23137e17e06906a9cc88 SHA-256: 2a30d26a40188d75086362b2673e6f11241e07553c9e2813be3574e46f17e8c5
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm, with numerous URLs pointing to potentially compromised or disposable hosting. The presence of external URIs and link farm characteristics suggests the document is designed to lure users to external sites, likely for phishing or to download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://samsungklimalar.com/upload/ckfinder/files/2525600603.pdf In PDF document text
    • http://medicare-darmstadt.de/bilder/UserImages/file/4784535315.pdfIn PDF document text
    • http://swaving-stalinrichting.nl/ckfinder/userfiles/files/nerotigagilutime.pdfIn PDF document text
    • http://cetinelektrik.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/161345c0781f63---mepotakujavudululalami.pdfIn PDF document text
    • https://anfauglir.com/images/file/88458117141.pdfIn PDF document text
    • https://alwillislifecenter.org/ckfinder/userfiles/files/44539731008.pdfIn PDF document text
    • http://ongxoanhdpe.vn/upload/files/57246307019.pdfIn PDF document text
    • https://viessmannboilers.ca/fck_upload/file/mapolavavuki.pdfIn PDF document text
    • http://vncdata.net/app/webroot/uploads/files/77053253546.pdfIn PDF document text
    • https://hyundainhapkhau.vn/upload/files/8480284022.pdfIn PDF document text
    • https://www.spoton.pet/wp-content/plugins/super-forms/uploads/php/files/6al825tfukl8bn2389forr1hcr/90964721361.pdfIn PDF document text
    • https://gresathouse.com/wp-content/plugins/super-forms/uploads/php/files/52906089660208fe201f4c8ad31974c3/lizuse.pdfIn PDF document text
    • http://imagespa.mx/wp-content/plugins/formcraft/file-upload/server/content/files/16136639e7791a---xakoviwitojozipamivip.pdfIn PDF document text
    • http://lokalsport.no/userfiles/file/xuwelifozipovitodopazosi.pdfIn PDF document text
    • http://johndanton.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/muberoxezuwibiriribamef.pdfIn PDF document text
    • https://pmfegypt.com/userfiles/files/74474836835.pdfIn PDF document text
    • http://stroyvodservice.ru/upload/File/saxude.pdfIn PDF document text
    • http://dvarenda.ru/upload/file/xuzimoxot.pdfIn PDF document text
    • http://hoaisonland.vn/upload/files/75066394157.pdfIn PDF document text
    • http://elitk.ru/_files/tuzizakewumexidu.pdfIn PDF document text
    • https://www.kadinlarsitesi.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613920adb6390---jileja.pdfIn PDF document text
    • http://www.chinahkcarplate.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132a096df85a---tikufapupe.pdfIn PDF document text
    • https://sikahaiphong.com/images/news/files/81998774450.pdfIn PDF document text
    • http://systemsbiology.at/uploads/assets/file/79669243530.pdfIn PDF document text
    • http://ksiclub.org/projects/achievemore/admin/upload/fckImages/file/14014388342.pdfIn PDF document text
    • http://whatdwellswithin.com/file/3757396174.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=close+obsession+anna+zaires+pdfPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e0a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0A5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f8bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8BC 10624 bytes
SHA-256: 64d0940ddbad938d2ac01cffecd0aa70878164c0b678637cd7b39363378a171d
font_02_sfnt_off000110ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110EC 17340 bytes
SHA-256: 29f4fdba22e5780169c371784b6b010fc3c8a2253f5b803b837ae41afa014d50